PURPOSE: To prevent loads from being operated in error by arranging so as to obtain the same output condition continuously when a battery power source is reconnected at a device in which loads are being driven in an operational mode of any switch turned on within a multitude of switches.

CONSTITUTION: An airflow control circuit of an air conditioner has automatic return switches, i.e., automatic regulate switch SW0, high speed switch SW1, low speed switch SW2, and off switch SW3 for each operational mode of an airflow control fan. A reset circuit 3 which gives the output "1" only from a circuit corresponding to any switch turned on within these switches SW0WSW3 and a latch circuit 3 are also provided. In the above circuits, a condenser C is connected between a load side contact of the off switch SW3 and a battery 1, and a differentiating circuit 6 consisting of the condenser C and a resistor M3 is provided to attain the desired objective.